This is a Sony title. The audio was already remixed for the 2001 reissue and I'm sure the same mix will be used for the 5.1 track here. But they'd damn well better include the mono mix, since the 5.1 has way too much re-recorded dialogue -- Palin's redone narration is especially bad. There's no mention of mono in the Blu-ray.com piece, so I'm worried.